The "Pi in the Sky" math challenge gives students a chance to take part in recent discoveries and upcoming celestial events, all while using math and pi just like NASA scientists and engineers. In this problem from the 10th set, students use pi to determine the volume of a rock core collected by the Perseverance Mars rover. Materials Pi in the Sky 10: Tubular Tally worksheet – download PDF (for best results, download and print from Adobe Reader) Pi in the Sky 10: Tubular Tally answer key – down